| amputator | (noun) a surgeon who removes part or all of a limb | - |
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| amygdalotomy | (noun) psychosurgery in which amygdaloid fibers that mediate limbic system activity are severed (in cases of extreme uncontrollable violence) | - |
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| amyotonia | (noun) lack of normal muscular tension or tonus | Synonyms: atonia, atonicity, atony |
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| anastomose | (verb) cause to join or open into each other by anastomosis | Synonyms: inosculate |
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| (verb) come together or open into each other | Synonyms: inosculate |
| anastomosis | (noun) a natural or surgical joining of parts or branches of tubular structures so as to make or become continuous | Synonyms: inosculation |
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| anastomotic | (adjective) of or relating to or exhibiting anastomosis | - |
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| anatomic | (adjective) of or relating to the structure of the body | Synonyms: anatomical |
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| (adjective) of or relating to the branch of morphology that studies the structure of organisms | Synonyms: anatomical |
| anatomical | (adjective) of or relating to the structure of the body | Synonyms: anatomic |
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| (adjective) of or relating to the branch of morphology that studies the structure of organisms | Synonyms: anatomic |
| (noun) an expression that relates to anatomy | Synonyms: anatomical reference |
| anatomically | (adverb) with respect to anatomy | - |
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| anatomise | (verb) dissect in order to analyze | Synonyms: anatomize |
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| anatomist | (noun) an expert in anatomy | - |
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| anatomize | (verb) analyze down to the smallest detail | - |
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| (verb) dissect in order to analyze | Synonyms: anatomise |
| anatomy | (noun) a detailed analysis | - |
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| (noun) alternative names for the body of a human being | Synonyms: bod, build, chassis, figure, flesh, form, frame, human body, material body, physical body, physique, shape, soma |
| (noun) the branch of morphology that deals with the structure of animals | Synonyms: general anatomy |
| anatotitan | (noun) one of the largest and most famous duck-billed dinosaurs | - |
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| anatoxin | (noun) a bacterial toxin that has been weakened until it is no longer toxic but is strong enough to induce the formation of antibodies and immunity to the specific disease caused by the toxin | Synonyms: toxoid |
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| ancestor | (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: antecedent, ascendant, ascendent, root |
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| angiomatous | (adjective) of or related to or having a tumor of the kind known as an angioma | - |
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| angiotonin | (noun) any of several vasoconstrictor substances (trade name Hypertensin) that cause narrowing of blood vessels | Synonyms: angiotensin, Hypertensin |
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| animator | (noun) the technician who produces animated cartoons | - |
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| (noun) someone who imparts energy and vitality and spirit to other people | Synonyms: energiser, energizer, vitaliser, vitalizer |
| annihilator | (noun) a total destroyer | - |
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| annotator | (noun) a commentator who writes notes to a text | - |
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| annunciator | (noun) an indicator that announces which electrical circuit has been active (as on a telephone switchboard) | - |
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| annunciatory | (adjective) relating to the act of announcing or being announced | - |
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| anticipator | (noun) one who anticipates | Synonyms: anticipant |
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| anticipatory | (adjective) in anticipation | Synonyms: prevenient |
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| antilepton | (noun) the antiparticle of a lepton | - |
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| antipasto | (noun) a course of appetizers in an Italian meal | - |
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| antiproton | (noun) an unstable negatively charged proton; the antiparticle of a proton | - |
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| antiprotozoal | (noun) a medicinal drug used to fight diseases (like malaria) that are caused by protozoa | Synonyms: antiprotozoal drug |
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| antitoxic | (adjective) counteracting a toxin or poison | - |
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| antitoxin | (noun) an antibody that can neutralize a specific toxin | - |
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| antonym | (noun) a word that expresses a meaning opposed to the meaning of another word, in which case the two words are antonyms of each other | Synonyms: opposite, opposite word |
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| antonymous | (adjective) of words: having opposite meanings | - |
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| antonymy | (noun) the semantic relation that holds between two words that can (in a given context) express opposite meanings | - |
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| apatosaur | (noun) huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic | Synonyms: apatosaurus, Apatosaurus excelsus, brontosaur, brontosaurus, thunder lizard |
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| apatosaurus | (noun) huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic | Synonyms: apatosaur, Apatosaurus excelsus, brontosaur, brontosaurus, thunder lizard |
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| apoplectoid | (adjective) resembling apoplexy | Synonyms: apoplectiform |
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| apoptosis | (noun) a type of cell death in which the cell uses specialized cellular machinery to kill itself; a cell suicide mechanism that enables metazoans to control cell number and eliminate cells that threaten the animal's survival | Synonyms: caspase-mediated cell death, programmed cell death |
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| apostolic | (adjective) of or relating to or deriving from the Apostles or their teachings | Synonyms: apostolical |
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| (adjective) proceeding from or ordered by or subject to a pope or the papacy regarded as the successor of the Apostles | Synonyms: apostolical, papal, pontifical |
| apostolical | (adjective) of or relating to or deriving from the Apostles or their teachings | Synonyms: apostolic |
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| (adjective) proceeding from or ordered by or subject to a pope or the papacy regarded as the successor of the Apostles | Synonyms: apostolic, papal, pontifical |
| appendectomy | (noun) surgical removal of the vermiform appendix | Synonyms: appendicectomy |
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| appendicectomy | (noun) surgical removal of the vermiform appendix | Synonyms: appendectomy |
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| applicator | (noun) a device for applying a substance | Synonyms: applier |
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| applicatory | (adjective) readily applicable or practical | Synonyms: applicative |
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| appreciator | (noun) a person who is fully aware of something and understands it | - |
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| approbatory | (adjective) expressing or manifesting praise or approval | Synonyms: affirmative, approbative, approving, plausive |
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| appropriator | (noun) someone who takes for his or her own use (especially without permission) | - |
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| arbitrator | (noun) someone chosen to judge and decide a disputed issue | Synonyms: arbiter, umpire |
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| architectonic | (adjective) of or pertaining to construction or architecture | Synonyms: tectonic |
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| architectonics | (noun) the science of architecture | Synonyms: tectonics |
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| argentous | (adjective) relating to compounds in which silver is univalent | - |
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| aristocracy | (noun) a privileged class holding hereditary titles | Synonyms: nobility |
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| (noun) the most powerful members of a society | Synonyms: gentry |
| aristocrat | (noun) a member of the aristocracy | Synonyms: blue blood, patrician |
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| aristocratic | (adjective) belonging to or characteristic of the nobility or aristocracy | Synonyms: aristocratical, blue-blooded, blue, gentle, patrician |
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| aristocratical | (adjective) belonging to or characteristic of the nobility or aristocracy | Synonyms: aristocratic, blue-blooded, blue, gentle, patrician |
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| aristocratically | (adverb) in an aristocratic manner | - |
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| aristocratism | (noun) the principles, practices or characteristics of aristocracy. | - |
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| arrogator | (noun) a person who through conceit makes pretentious claims to rights or advantages that he or she is not entitled to or to qualities that he or she does not possess | - |
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| articulator | (noun) a movable speech organ | - |
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| (noun) someone who pronounces words | - |
| articulatory | (adjective) of or relating to articulation | Synonyms: articulative |
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| asbestos | (noun) a fibrous amphibole; used for making fireproof articles; inhaling fibers can cause asbestosis or lung cancer | - |
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| asbestosis | (noun) lung disease caused by inhaling asbestos particles | - |
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| ascomycetous | (adjective) related to or characteristic of fungi of the class Ascomycetes | - |
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| asphyxiator | (noun) a manually operated device for extinguishing small fires | Synonyms: extinguisher, fire extinguisher |
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| aspirator | (noun) a pump that draws air or another gas through a liquid | - |
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| assassinator | (noun) a murderer (especially one who kills a prominent political figure) who kills by a surprise attack and often is hired to do the deed | Synonyms: assassin, bravo |
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| asseverator | (noun) someone who claims to speak the truth | Synonyms: affirmer, asserter, avower, declarer |
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| assimilator | (noun) someone (especially a child) who learns (as from a teacher) or takes up knowledge or beliefs | Synonyms: learner, scholar, student |
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| assimilatory | (adjective) capable of taking (gas, light, or liquids) into a solution | Synonyms: assimilating, assimilative |
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| associatory | (adjective) characterized by or causing or resulting from the process of bringing ideas or events together in memory or imagination | Synonyms: associative |
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| astomatal | (adjective) lacking a stoma or stomata | - |
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| astomatous | (adjective) having no mouth or mouthlike opening | Synonyms: mouthless |
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| astonied | (adjective) filled with the emotional impact of overwhelming surprise or shock | Synonyms: amazed, astonished, astounded, stunned |
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| astonish | (verb) affect with wonder | Synonyms: amaze, astound |
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| astonished | (adjective) filled with the emotional impact of overwhelming surprise or shock | Synonyms: amazed, astonied, astounded, stunned |
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| astonishing | (adjective) so surprisingly impressive as to stun or overwhelm | Synonyms: astounding, staggering, stupefying |
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| (adjective) surprising greatly | Synonyms: amazing |
| astonishingly | (adverb) in an amazing manner; to everyone's surprise | Synonyms: amazingly, surprisingly |
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| astonishment | (noun) the feeling that accompanies something extremely surprising | Synonyms: amazement |
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| astound | (verb) affect with wonder | Synonyms: amaze, astonish |
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| astounded | (adjective) filled with the emotional impact of overwhelming surprise or shock | Synonyms: amazed, astonied, astonished, stunned |
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| astounding | (adjective) so surprisingly impressive as to stun or overwhelm | Synonyms: astonishing, staggering, stupefying |
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| (adjective) bewildering or striking dumb with wonder | Synonyms: dumbfounding, dumfounding |
| astrogator | (noun) the navigator of a spacecraft | - |
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| asymptomatic | (adjective) having no symptoms of illness or disease | Synonyms: symptomless |
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| asymptote | (noun) a straight line that is the limiting value of a curve; can be considered as tangent at infinity | - |
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| asymptotic | (adjective) relating to or of the nature of an asymptote | - |
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| asymptotically | (adverb) toward an asymptote | - |
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| asyndeton | (noun) the omission of conjunctions where they would normally be used | - |
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| asystole | (noun) absence of systole; failure of the ventricles of the heart to contract (usually caused by ventricular fibrillation) with consequent absence of the heart beat leading to oxygen lack and eventually to death | Synonyms: cardiac arrest, cardiopulmonary arrest |
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| atheromatous | (adjective) of or relating to or resembling atheroma | Synonyms: atheromatic |
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| athetosis | (noun) a continuous succession of slow, writhing, involuntary movements of the hands and feet and other body parts | - |
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| atole | (noun) eaten as mush or as a thin gruel | - |
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| atoll | (noun) an island consisting of a circular coral reef surrounding a lagoon | - |
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| atom | (noun) (physics and chemistry) the smallest component of an element having the chemical properties of the element | - |
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| (noun) (nontechnical usage) a tiny piece of anything | Synonyms: corpuscle, molecule, mote, particle, speck |
| atomic | (adjective) (weapons) deriving destructive energy from the release of atomic energy | Synonyms: nuclear |
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| (adjective) of or relating to or comprising atoms | - |
| (adjective) immeasurably small | - |
| atomisation | (noun) separating something into fine particles | Synonyms: atomization, fragmentation |
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| (noun) annihilation by reducing something to atoms | Synonyms: atomization |
| atomise | (verb) break up into small particles | Synonyms: atomize |
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| (verb) strike at with firepower or bombs | Synonyms: atomize, nuke, zap |
| (verb) spray very finely | Synonyms: atomize |
| atomiser | (noun) a dispenser that turns a liquid (such as perfume) into a fine mist | Synonyms: atomizer, nebuliser, nebulizer, spray, sprayer |
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| atomism | (noun) (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles | Synonyms: atomic theory, atomist theory, atomistic theory |
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| (noun) (psychology) a theory that reduces all mental phenomena to simple elements (sensations and feelings) that form complex ideas by association | - |
| atomistic | (adjective) divided into separate and often disparate elements | Synonyms: atomistical |
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| atomistical | (adjective) divided into separate and often disparate elements | Synonyms: atomistic |
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